Link to on-line chapter section: Section 19-7: Magnetic Field from a Long Straig

Question

Link to on-line chapter section: Section 19-7: Magnetic Field from a Long Straight Wire The picture above shows a cross-sectional view through a set of four parallel current-carrying wires. All four wires carry identical currents into the page, and there is one wire going through each corner of a square. In what direction is the net magnetic field, because of these four wires, at the center of the square? left right up down into the screen out of the screen the net field is zero Now, as shown in the picture below, the direction of the current in both the wires on the left has been reversed. All four currents are still of equal magnitude. In what direction is the net magnetic field, because of these four wires, at the center of the square? left right up down into the screen out of the screen the net field is zero

Explanation / Answer

a) The net field is zero

b) up

using right hand rule and superposition principle.

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